A284327 - cp's OEIS frontend

A284327 a(n) is the least positive integer such that n^2 + a(n)^2 and n^2 + (a(n) - 2)^2 are primes.

n	a(n)
1	1
2	1
3	10
4	1
5	4
6	1
7	10
8	5
9	16
10	1
11	6
12	25
13	10
14	1
15	4
16	1
17	10
18	7
19	16
20	1
21	46
22	15
23	20
24	1
25	6
26	1
27	22
28	15
29	6
30	13
31	6
32	5
33	190
34	11
35	18
36	1
37	30
38	15
39	46
40	1
41	46
42	25
43	10
44	21
45	16
46	21
47	10
48	37
49	6
50	19
51	16
52	5
53	12
54	1
55	6
56	1
57	52
58	5
59	26
60	31
61	26
62	45
63	40
64	11
65	4
66	1
67	20
68	7
69	196
70	19
71	16

[1, 1, 10, 1, 4, 1, 10, 5, 16, 1, 6, 25, 10, 1, 4, 1, 10, 7, 16, 1, 46, 15, 20, 1, 6, 1, 22, 15, 6, 13, 6, 5, 190, 11, 18, 1, 30, 15, 46, 1, 46, 25, 10, 21, 16, 21, 10, 37, 6, 19, 16, 5, 12, 1, 6, 1, 52, 5, 26, 31, 26, 45, 40, 11, 4, 1, 20, 7, 196, 19, 16]

cp's OEIS Frontend

A284327 a(n) is the least positive integer such that n^2 + a(n)^2 and n^2 + (a(n) - 2)^2 are primes.

Table of values

List of values

n	a(n)
1	1
2	1
3	10
4	1
5	4
6	1
7	10
8	5
9	16
10	1
11	6
12	25
13	10
14	1
15	4
16	1
17	10
18	7
19	16
20	1
21	46
22	15
23	20
24	1
25	6
26	1
27	22
28	15
29	6
30	13
31	6
32	5
33	190
34	11
35	18
36	1
37	30
38	15
39	46
40	1
41	46
42	25
43	10
44	21
45	16
46	21
47	10
48	37
49	6
50	19
51	16
52	5
53	12
54	1
55	6
56	1
57	52
58	5
59	26
60	31
61	26
62	45
63	40
64	11
65	4
66	1
67	20
68	7
69	196
70	19
71	16

n	a(n)
1	1
2	1
3	10
4	1
5	4
6	1
7	10
8	5
9	16
10	1
11	6
12	25
13	10
14	1
15	4
16	1
17	10
18	7
19	16
20	1
21	46
22	15
23	20
24	1
25	6
26	1
27	22
28	15
29	6
30	13
31	6
32	5
33	190
34	11
35	18
36	1
37	30
38	15
39	46
40	1
41	46
42	25
43	10
44	21
45	16
46	21
47	10
48	37
49	6
50	19
51	16
52	5
53	12
54	1
55	6
56	1
57	52
58	5
59	26
60	31
61	26
62	45
63	40
64	11
65	4
66	1
67	20
68	7
69	196
70	19
71	16

n	a(n)
1	1
2	1
3	10
4	1
5	4
6	1
7	10
8	5
9	16
10	1
11	6
12	25
13	10
14	1
15	4
16	1
17	10
18	7
19	16
20	1
21	46
22	15
23	20
24	1
25	6
26	1
27	22
28	15
29	6
30	13
31	6
32	5
33	190
34	11
35	18
36	1
37	30
38	15
39	46
40	1
41	46
42	25
43	10
44	21
45	16
46	21
47	10
48	37
49	6
50	19
51	16
52	5
53	12
54	1
55	6
56	1
57	52
58	5
59	26
60	31
61	26
62	45
63	40
64	11
65	4
66	1
67	20
68	7
69	196
70	19
71	16